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Online Service Usage You are a travel agent and wish to estimate, with 97% confidence, the proportion of vacationers who use an online service or the internet to make travel reservations.
For your study on the food consumption habits of teenage males, you randomly select 10 teenage males and ask how many 12-ounce servings of soda he drinks each day. The results are listed below. at =
You interview a random sample of 50 adults. The results of the survey show that 46% of the adults said they were more likely to buy a product when there are free samples. At a=0.01, can you reject t
Based on the information compute the confidence interval using the t-distribution 1. A tire manufacturer wishes to investigate the tread life of its tires. A sample of 20 tires driven 60,000 miles r
Let us say you took a random sample of n = 216 numerical entries from the file and r = 52 of the entries had a first nonzero digit of 1. Let p represent the population proportion of all numbers in t
Based on the following information compute: Population mean Show your work
What is the variance of the random varible of ybar which is the mean of n=15 observations from small high schools? What is the standard deviation of the random variable ybar which is mean of n=15 obse
In a hypotheses of H0 : mu = 7 against the alternative Ha : mu < 7 from a normal population with known standard deviation sigma = 1 a sample of size 16 is taken and Z value calculated equals -1.
What is the (estimated) standard error of the mean? Produce a 95% confidence interval for the true mean percentage of ethanol in DWI arrestees.
A random sample of 20 sales at Suburban locations found a sample mean of $17, 236 and a sample standard deviation of $1,974. Test the researcher's belief at a 5% level of significance. What is your
An instructor believes that 20% or less of the students who finish a statistics course get an "A" grade. A sample of 90 students was taken and 25 of the students in the sample received an "A" grade.
The sample revealed a mean of 11.7 ounces and a sample standard deviation of 0.8 ounces. At a 1% level of significance, test to see if the mean of the population is at least 12 ounces. What is your
Use the data to find a point estimate of the population mean weight of fire ants. What estimator did you use? Use the data to find a point estimate of the population variance. What estimator did you u
What is the probability that student from this class will pass (NOT fail)
Jean Researcher is studying the percentage of ethanol in DWI arrestees's blood. She tests 16 subjects and finds a mean 1.8% with a standard deviation of .2%
A population has a variance of 34. What is the standard deviation of this population ? ( 2 decimal places).
The IRS randomly selected 2950 tax returns for audit and discovered that 1900 of them had serious errors. The sample is larger so that sample classical confidence interval for p may be used below.
Suppose weights of the checked baggage of airline passengers follow a nearly normal distribution with mean 46 pounds and standard deviation 3.1 pounds. Most airlines charge a fee for baggage that we
A local lawn service has determined the average time it takes to mow an average residential yard is thirty-five minutes. If mowing times are independent and constant, what is the probability it will
Find the 95% confidence interval for the variance of the weights of containers of motor oil if a sample of 14 containers has a variance of 3.2. Assume the variable is normally distributed.
For Binomial distribution with n = 10 and probability of success p = 0.4 find probability of less than 3 successes (x < 3) (3 is not included).
Find the 90% confidence interval for the standard deviation for the time it takes an inspector to check a bus for safety if a sample of 27 buses has a standard deviation of 6.8 minutes. Assume the v
A researcher is interested in estimating the average salary of police officers in a large city. She wants to be 99% confident that her estimate is correct. If the standard deviation is $1050, how la
The weights of professional baseball players follow a normal distribution with a mean of 200 pounds and a standard deviation of 25 pounds. Find the probability that a randomly selected professional